|Publication number||US4945346 A|
|Application number||US 07/390,289|
|Publication date||Jul 31, 1990|
|Filing date||Aug 7, 1989|
|Priority date||Aug 7, 1989|
|Also published as||CA2021999A1|
|Publication number||07390289, 390289, US 4945346 A, US 4945346A, US-A-4945346, US4945346 A, US4945346A|
|Inventors||John P. Schmiemann|
|Original Assignee||Schmiemann John P|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Referenced by (23), Classifications (13), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an audible circuit tracer and more particularly to a compact device for indicating in an audible manner whether an electrical outlet is live and a safe method for terminating electric power to said outlet.
When an electrician, construction worker, or homeowner has to service or change an outlet or electrical device, it is necessary and safe practice to shut off the circuit breaker or fuse supplying power. When unmarked, finding the proper fuse or circuit breaker is time consuming, and wastes the time of skilled labor.
A number of devices have been developed for indicating the presence of electrical power and for the interruption of power. Such devices generally can be complicated or require that the outlet be approached for inserting the devices.
The following U.S. Pat. Nos. illustrate such devices: 1,305,514, 2,518,812, 2,696,607, 4,155,082, and 4,223,307. None of the preceding patents discloses the present invention.
In this invention there is provided a device sufficiently compact that it may be carried on a tool belt and capable of producing a sound which can be heard at a distance so that it is not necessary to leave the location of the circuit breaker or fuse box to determine whether or not the power feeding the outlet or electrical device has been turned off in a remote location.
In accordance with a preferred embodiment of this invention there is provided a small cylindrical housing containing at one end a piezo electric buzzer and at the other end the prongs to be inserted into an electrical outlet. Within the housing is a transformer to drop the voltage and a rectifier to convert the ac into a dc voltage which is then delivered to the piezo electric buzzer.
With such a device installed in an outlet or electrical device, the worker can hear the buzzer even though he/she may not be able to have the outlet or electrical device in view. The buzzer will shut off when the proper circuit breaker or fuse controlling the outlet or electrical device has been located.
It is thus a principal object of this invention to provide a device for indicating audibly when electrical power is applied to an outlet.
Other objects and advantages of this invention will hereinafter become obvious from the following description of preferred embodiments of this invention.
FIG. 1 is an isometric view of a preferred embodiment of this invention.
FIG. 2 is an elevation view in partial section of the embodiment shown in FIG. 1.
FIG. 3 is an isometric view of an accessory for using the device with a light socket.
FIG. 4 is an isometric view of an accessory for using the device with hard-wired appliances and other electrical equipment.
Referring to FIG. 1, audible circuit tracer 10 consists of a cylindrical housing 12 having electrical prongs 14 for engaging the three openings (including ground) in a typical electrical outlet, and radially disposed openings 16 at the other end. Tracer 10 is portable and palm size by which is meant herein that the device is small enough to be cradled in the hand of the average size adult person, and is suitable for being carried around and, if desired, hung from a tool belt.
Openings 16 are provided with shutters 18 which are connected together. When rotated in the direction shown by the arrow, the size of openings 16 may be reduced in order to muffle the sound emanating from within housing 12. By rotating shutters 18 in the opposite direction the size of openings 16 is increased and the sound emanating increases in intensity. Shutters 18 are moved by the tips of one's fingers. An opening 20 for a light bulb 21 is located at some convenient point in the wall of housing 12.
At one end of housing 12 as illustrated is connected to a key ring 22 through a loop 24 attached to housing 12 thereby making it possible and convenient to carry tracer 10 on tool belt.
As seen in FIG. 2, housing 12 consists of a cylindrical tube 26 having a plug 28 at one end to carry one end of all of prongs 14. Two of prongs 14 are wired through conductors 32 and 34 to the primary side of a step down transformer 36. A pair of leads 38 and 42 go from the secondary side of transformer 36 to a piezo two tone buzzer 44 through a full wave bridge rectifier 46.
Electric light bulb 21 is wired in parallel across electrical leads 32 and 34 to glow when there is electrical power present.
In the use of audible circuit tracer 10, the latter is plugged into the outlet to be monitored. If the outlet is powered then buzzer 44 will sound, and light 21 will glow. The principal and most important use of tracer 10 is when the outlet or electrical device is powered and the worker must go to the circuit breaker or fuse box to turn off the power and is out of sight of the outlet or electrical device. In such a case the worker will adjust the sound level using shutters 18 so that he will hear the buzzing where the circuit breakers or fuses are located. With tracer 10 plugged into the outlet the buzzer will shut off when he or she locates the proper circuit breaker or fuse controlling the outlet or electrical device or tries different breakers or fuses until the right one is located.
When the electric outlet to be checked is the socket for a light bulb, then adaptor 48 shown in FIG. 3 may be employed. Adaptor 48 is provided at one end with male threaded extension 52 to go into the socket to be tested, and a face 54 at the other end having openings 56 to receive prongs 14 of tracer 10. Thus, with adaptor 48 threaded into the light socket to be tested and tracer 10 plugged into the other end of adaptor 10 the procedure as described above is repeated to test the integrity of the socket.
In the event an electrical appliance or other equipment which is hard-wired is to be tested, adapter 70 shown in FIG. 4 may be employed. Adapter 70 consists of a body 72 with sockets 74 to accommodate prongs 14 of tracer 10 and a pair of leads 76 electrically tied to sockets 74 at one end and terminating in a pair of insulated alligator clips 78 for using in making the connection to the appliance for determining if there is power available.
In the event the circuit breaker or fuse box is very remotely located where there is a question whether the sound emitted by tracer 10 will carry a sufficient distance to be heard by the worker, any ordinary electrical extension cord may be plugged into the outlet and tracer 10 plugged into the other end of the extension cord which may be placed at a more convenient location.
While only a preferred embodiment of the invention has been described it is understood that many variations of this invention are possible in accordance with the principles of this invention as defined in the claims which follow.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US305514 *||Sep 23, 1884||Machinery for the manufacture of cans|
|US2518812 *||Jul 6, 1948||Aug 15, 1950||Oswald Carl L||Safety outlet box with pilot light|
|US2696607 *||Jul 16, 1952||Dec 7, 1954||Witkin Leon C||Circuit control and indicator|
|US3277465 *||Feb 25, 1963||Oct 4, 1966||Potter Bronson M||Electrically operated audible alarm|
|US3879726 *||Oct 9, 1973||Apr 22, 1975||Mallory & Co Inc P R||Audible alarm unit|
|US4155082 *||Nov 16, 1977||May 15, 1979||Ian C. Jones and Leonard G. McDowell||Electrical connectors including power failure warning means|
|US4223307 *||Sep 7, 1978||Sep 16, 1980||Albritton James W||Delayed power interruption alarm|
|US4725772 *||Apr 1, 1982||Feb 16, 1988||Peak Rex W||Electrical circuit tester selectively responsive to either presence or absence of AC power|
|US4776018 *||Aug 27, 1985||Oct 4, 1988||Laurent Cordier||Removable sound or/and display apparatus|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5109200 *||Nov 6, 1990||Apr 28, 1992||Dushane Steven D||Electrically self-adjusting, compact and light-weight remote circuit tester|
|US5331283 *||Nov 23, 1992||Jul 19, 1994||Sheldon Alan L||Apparatus for detecting a completed electrical circuit at an electrical output receptacle|
|US5633625 *||Mar 20, 1995||May 27, 1997||Saturn Electronics & Engineering, Inc.||Electronic chime module and method|
|US6657435 *||Sep 19, 2001||Dec 2, 2003||Richard A. Brown||Audible circuit breaker|
|US6731217||Sep 13, 2002||May 4, 2004||Michael A. Warner||Electrical circuit tester|
|US6979787 *||Mar 1, 2004||Dec 27, 2005||Christopher John Davies||Article for de-energizing a branch electrical circuit, and related processes|
|US7102344||May 27, 2005||Sep 5, 2006||Short Barry W F||Circuit tester|
|US7148698||Sep 20, 2002||Dec 12, 2006||Snap-On Incorporated||Fuse saving tester for fused circuit|
|US7416440||Jul 12, 2006||Aug 26, 2008||Consolidated Edison Company Of New York, Inc.||Modular electrical adapter|
|US7534108 *||Apr 30, 2007||May 19, 2009||Jen-Ching Wang||Parking alarm of a towing connector|
|US7594816 *||Sep 25, 2008||Sep 29, 2009||Jen-Ching Wang||Female connector member for towing connector|
|US8674817 *||Jan 23, 2012||Mar 18, 2014||Mallory Sonalert Products, Inc.||Electronic sound level control in audible signaling devices|
|US8797176||Dec 15, 2011||Aug 5, 2014||Mallory Sonalert Products, Inc.||Multi-sensory warning device|
|US9030318||Mar 15, 2013||May 12, 2015||Mallory Sonalert Products, Inc.||Wireless tandem alarm|
|US9116178 *||Oct 11, 2012||Aug 25, 2015||Reliance Controls Corporation||Circuit tester with variable volume audible voltage indication|
|US9165440||Feb 21, 2014||Oct 20, 2015||Mallory Sonalert Products, Inc.||Multi-sensory warning device|
|US9240293||Feb 22, 2011||Jan 19, 2016||Panoramic Power Ltd.||Circuit tracer|
|US20040017203 *||Sep 20, 2002||Jan 29, 2004||Becker Thomas P.||Fuse saving tester for fused circuit|
|US20040246638 *||Mar 1, 2004||Dec 9, 2004||Davies Christopher John||Article for de-energizing a branch electrical circuit, and related processes|
|US20100102940 *||Oct 23, 2008||Apr 29, 2010||Mallory Sonalert Products, Inc.||Electronic sound level control in audible signaling devices|
|US20110205037 *||Feb 23, 2010||Aug 25, 2011||Denis Barish||Circuit buzzer|
|US20110208450 *||Feb 22, 2011||Aug 25, 2011||Panoramic Power Ltd.||Circuit Tracer|
|USRE41466 *||Dec 11, 2008||Aug 3, 2010||Snap-On Incorporated||Fuse saving tester for fused circuit|
|U.S. Classification||340/656, 181/141, 340/384.6, 324/508|
|International Classification||G08B3/10, G01R19/155, G08B21/20|
|Cooperative Classification||G08B21/20, G08B3/10, G01R19/155|
|European Classification||G08B3/10, G08B21/20, G01R19/155|
|Mar 8, 1994||REMI||Maintenance fee reminder mailed|
|Jul 31, 1994||LAPS||Lapse for failure to pay maintenance fees|
|Oct 11, 1994||FP||Expired due to failure to pay maintenance fee|
Effective date: 19940803